Chemical Technology Group, Bhabha Atomic Research Centre, Mysuru 571130, India.
Health Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India.
Radiat Prot Dosimetry. 2024 Jul 17;200(11-12):979-982. doi: 10.1093/rpd/ncae001.
Determination of uranium isotopes in ground water plays a key role in assessment of geochemical condition of ground water and for estimating ingestion dose received by the general public because of uranium intake through drinking water. An attempt has been made in the present study to estimate isotopic composition and activity ratios (AR) of uranium isotopes by analysing the ground water samples using alpha spectrometry. Associated age-dependent ingestion dose was also calculated for the public of different age groups. 238U, 235U and 234U activity concentration was found to vary in the ranges of 5.85 ± 1.19 to 76.67 ± 4.16, < 0.90 to 3.15 ± 0.84 and 6.52 ± 1.25 to 107.02 ± 4.92 mBq/L, respectively. 235U/238U AR varies from 0.038 to 0.068 with an average of 0.047 which is close to 0.046 implies that uranium in the ground water is from natural origin. Uranium concentration was found to vary in the range of 0.47 ± 0.10 μg/L to 6.20 ± 0.34 μg/L with a mean value of 3.01 ± 0.23 μg/L, which is much lower than national as well as international recommendation value. Annual ingestion dose to the public of all age groups for uranium intake through drinking water ranges from 0.60 ± 0.11 to 19.50 ± 1.03 μSv/y.
地下水铀同位素的测定在评估地下水地球化学条件和估算公众因饮用水摄入铀而接受的内照射剂量方面起着关键作用。本研究试图通过α谱法分析地下水样品来估算铀同位素的同位素组成和活度比（AR）。还为不同年龄组的公众计算了与年龄相关的内照射剂量。发现 238U、235U 和 234U 的活度浓度分别在 5.85±1.19 至 76.67±4.16、<0.90 至 3.15±0.84 和 6.52±1.25 至 107.02±4.92 mBq/L 的范围内变化。235U/238U AR 从 0.038 到 0.068 不等，平均值为 0.047，接近 0.046，这表明地下水中的铀来自天然来源。铀浓度在 0.47±0.10μg/L 至 6.20±0.34μg/L 的范围内变化，平均值为 3.01±0.23μg/L，远低于国家和国际推荐值。所有年龄段人群通过饮用水摄入铀的年摄入量内照射剂量范围为 0.60±0.11 至 19.50±1.03μSv/y。
